21. Let’s hold a party to _____ your birthday and at the same time _____ you on your passing the driving test.
A．congratulate; celebrate B．celebrate; celebrate
C．celebrate; congratulate D．congratulate; congratulate
22. (2012·芜湖高二检测)—We don’t permit _____ in our school. Would you please put your cigarette out?
—Forgive me. I didn’t know.
A．to smoking B．to smoke
C．smoking D．having smoked
